Water-tube boiler.



W. DOUGHERTY & C. Y. JAMES. WATER TUBE BOILER.

APPLICATION FILED JULY 1a, 1007.

902,951. Patented Nov. a, 1908.

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W. DOUGHERTY 6: G. Y. JAMES.

WATER TUBE BOILER.

APPLICATION FILED JULY 18, 1907.

Patented Nov. 3, 1908.

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WILLIAM DOUGHERTY AND OARLETON Y. JAMES, OF CHESTER, PENNSYLVANIA.

WATER-TUBE BOILER.

Specification of Letters Patent.

Patented Nov. 3, 1908.

Application filed July 18, 1907. Serial No. 384,316.

To all whom it may concern:

Be it known that we, WILLIAM Docen- ERTY and CARLETON Y. JAMES, citizensof the United States, residin at Chester, in the county of Delaware andState of Pennsylvania, have invented certain new and useful Improvementsin Water Tube Boilers, of which the followin is a specification.

Our invention re ates to water tube boilers, and has for its object theproduction of a steam generator of the class in which the water isheated in tubes directly exposed to the burning furnace ases, thosetubes having special form an particular arrangement whereby it isbelieved that greater economy of construction is attained, and leakingat the joints of the tubes with the end boxes and drum under expansionwhile steaming prevented.

lVe accomplish the stated object by fashioning and associating the partsas illustrated in the accompanying drawings, of which Figure 1represents a vertical section lengthwise, and Fig. 2 shows an end viewpartly in vertical section.

Like reference letters are used to designate like parts throughout thespecification and drawings.

In the drawings the furnace grate is marked A, the front of the boilersetting is designated by the letter B and the back by C. The bridge wallis referred to by the letter D.

The longitudinal drum of the boiler is designated E, and is in 0 oncommunication with the front end box I and the rear end box G as iscustomary.

The tubes H and J have substantially the same form. That is to say, eachhas a substantially horizontal straight portion opening into an end box,and a vertical portion openmg into the drum. In addition to thosefeatures the outer-lying tubes J curve laterally lnward at the top fortheir connections with the drum, as shown in Fig. 2.

Suitably placed bafile plates K and L erected upon the brid e wall, andlike horizontal and vertical ba e plates M and N direct the products ofcombustion from the grate bars through the system of tubes as inlcatedby the arrows.

It will be observed that in the construction constituting our invention,the relatively horizontal portions of the tubes have each a slightupward inclination from the end box to which it is attached.

The tubes are arranged in vertical and horizontal rows. Those tubeswhich 0 en into an end box near the top of the box, t at is to say,nearest the drum E, extend to a point slightly beyond the middle of thedrum where the are connected with the drum in suitable ori ces, thecenters of those orifices for all the tubes in the uppermost row oftubes lying in the same vertical plane. Observed from the side,therefore, as in Fig. l, the ends of tubes appear to cross each other.The next lower row of tubes opening into either end box, extend stillfurther beyond the middle of drum E, and the vertical portions of thosetubes are in like manner secured in a row of orifices in the drumparallel to the row of orifices in which the first mentioned oruppermost row of tubes are secured. In regular, spaced order, each lowerrow of tubes extends further beyond the middle of the drum than the rowof tubes next above, and finally, the lowest row of tubes, and thelongest, are connected with the drum E near the tops of the end boxes.

In any tube there is but a single turn, and that is made a gradual bend.The result is an extremely rapid circulation in the tubes, so rapid, infact, as to practically eliminate the deposit of scale therein, and tomaterially increase the amount of steam generated in a given time beyondthe steaming capacity of water tube boilers in the same general classwith which we are acquainted.

Having now described our invention and explained the mode of itsoperation, what we claim is In a water tube boiler, the combination withthe furnace grate, of a longitudinal steam drum, end boxes opening intothe drum near the ends of the drum and arranged vortically, the body ofsaid end boxes being constructed greater in width than the diameter ofthe drum, bent tubes arranged lengthwise bclow the drum and each havinga horizontal portion connected with an end box and a ver tical portionconnected with the drum, and each of said tubes having a portionextending above the furnace grate, substantially as shown and described.

In testimony whereof we allix our signatures in presence of twoWitnesses.

WILLIAM DO UGllE It T Y. (JARLETON Y. JAMES.

Witnesses KlNesLnr MONTGOMERY, GERTRUDE HOWARD.

